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That's the Neat Part, you don't.
Review RFC 4106. In AES-GCM for IPSec ESP the IV is included in each frame prior to the ciphertext. "For a given key, the IV MUST NOT repeat," so there would be no point in configuring it in Wireshark as it's right there in the packet payload.
If it's not decrypting for you, something else is the problem.
